PRESS FORMING METHOD FOR ALUMINUM OR ALUMINUM ALLOY STOCK AND DEVICE THEREFOR

PURPOSE: To maintain shape and dimension of a formed part in high precision by press forming Al or Al alloy stock while making the temp. of stock for respective segment different. CONSTITUTION: After a stock M cooled to a low temp. of about -50 deg.C to -196 deg.C by a cooling medium of liquid nitro...

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Bibliographische Detailangaben
Hauptverfasser:	UJIHARA ARATA, IWASE TAKAKUNI, JINTA MASAHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PURPOSE: To maintain shape and dimension of a formed part in high precision by press forming Al or Al alloy stock while making the temp. of stock for respective segment different. CONSTITUTION: After a stock M cooled to a low temp. of about -50 deg.C to -196 deg.C by a cooling medium of liquid nitrogen is set on a blank holder 9 of normal temp., the stock M is pressed/fixed by the blank holder 9 and die face 7 of an upper holder 3. When the stock M as formed part is taken out from a lower die 5, the neighborhood of upper part T of stock M is considerably at high temp. than a low temp. region. Therefore, Temp. difference at returning to normal temp. is made smaller, thermal expansion near the upper part T after completion of forming is suppressed and lowering of precision of shape/ dimension of formed part due to thermal expansion can be prevented.